Snap-Fit Joints in Plastics
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Transcript of Snap-Fit Joints in Plastics
• Introduction to Snap-Fit Joints in Plastics
• Snap-Fit Joint Types
• Design Factors for Snap-Fit Joint
• FEM Demonstration
Content
• Bonding
• Welding
• Mechanical Joining
Plastic Joining Techniques
• Rivets
• Screws
• Inserts
• Molded Threads
• Press Fits
• Snap Fits
More demanding
tolerances
Constant strength
Requires undercut
Relaxation /
Creep-failure
Snap Fit
vs.
Press Fit
Pullout
Force
Insertion
Force> @
Pullout
ForceInsertion
Force
No Additional
Parts Needed
Requires Fastener
Components
Vibration Resistant
Less Energy
Required
May Loosen
Under Vibration
Requires Tightening
Operation
Snap Fit
vs.
Screws
Hermetic Seal
Difficult
Hermetic Seal
Easy
Dissimilar Materials
Integrally Molded
Compatible Materials
Special Welding
Equipment
Snap Fit
vs.
Welding